Portal 2 has a higher replay value not just because of the humor, also because of the multi player.
Problem with Noire is that's its to stiff a game, for story it should have been a good thing but the they way you solve crime case is very repetitive. Plus the character you play with just works on my nerves i don't like him at all.
What i do hope for La Noire that they besides future cases add like GTA IV another story with different characters. Especially that you get the chance to play a greaser

Buy a beat up old rod fix it up. Drag race or chicken races and so forth for either money or pink slip. To slowly advance until you beat the fastest racer per region you get the most awesome car and of course the girl
Would be ideal in LA Noire

and for those who liked and played a very old game called Streetrod